The directed <i>ortho</i> metalation - palladium catalyzed cross coupling connection. A general regiospecific route to 9-phenanthrols and phenanthrenes. Exploratory further metalation
作者:Jian-min Fu、Victor Snieckus
DOI:10.1139/v00-055
日期:2000.6.1
A new general and regiospecific synthesis of 9-phenanthrols (1 +2 3 4, Scheme 1, Table 1) proceeding by a Directed ortho Metalation (DoM), Suzuki-Miyaura cross coupling, and a new LDA-mediated Directed remote Metalation sequence is described. The facile Pd-catalyzed hydrogenolysis of the phenanthrols 4 into the corresponding phenanthrenes 5 via their triflates 18 translates the original DoM regioselectivity
通过定向邻金属化 (DoM)、Suzuki-Miyaura 交叉偶联和新的 LDA 介导的定向远程金属化序列进行的 9-菲酚(1 +2 3 4,方案 1,表 1)的新的通用和区域特异性合成是描述。通过三氟甲磺酸酯 18 的 Pd 催化氢解菲醇 4 为相应的菲 5 将原始的 DoM 区域选择性也转化为菲的一般合成(表 2)。进一步报道了菲衍生物的 DoM (19 20, 21; 24 25)、交叉偶联 (20c 23) 以及氧化-环收缩 (4b, 4f 28a, 28b) 化学。 关键词:9-菲醇,定向邻位金属化,铃木交叉偶联,合成。